I have a PIX-525 running version 6.2(2). Recently end-user reported their SIP calls across this PIX fail to work.
I get the users test their applications while I turned on "debug sip". I couldn't see any SIP-related messages except the following:
2008-04-22 12:42:05 Local4.Info 10.254.1.20 Apr 22 2008 12:42:03: %PIX-6-106015: Deny TCP (no connection) from 10.254.2.106/50543 to 10.142.65.101/5060 flags PSH ACK on interface outside
The following fixup commands are already in place by default:
fixup protocol h323 h225 1720
fixup protocol h323 ras 1718-1719
fixup protocol sip 5060
I have checked the conduit, static, route, and timeout statements. All seem okay.
Below is Release Notes of PIX 6.2(2):
I notice SIP-related bugs in the Open and Resolved Caveats. I'm not sure if I'm hitting any of those bugs because I'm not getting any SIP messages from "debug sip".